/*
 * Copyright 2010 Tom Gibara
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */
package com.tomgibara.crinch.lattice;

public interface JoinSemiLattice<E> extends SemiLattice<E> {

	//if unbounded, must accept null arguments (representing top)
	E join(E a, E b);
	
	JoinSemiLattice<E> boundedAbove(E top);

	E getTop();
	
	boolean isBoundedAbove();
	
}
